1014107-82-4Relevant articles and documents
Effect of dual fullerenes on lifetimes of charge-separated states of subphthalocyanine - triphenylamine - fullerene molecular systems
El-Khouly, Mohamed E.,Shim, Sun Hee,Araki, Yasuyuki,Ito, Osamu,Kay, Kwang-Yol
, p. 3910 - 3917 (2009/02/04)
Photoinduced intramolecular electron-transfer events of the newly synthesized subphthalocyanine-tripheny-lamine-fullerene triad (SubPc-TPA-Co 60) and subphthalocyanine-triphenylamine-bisfullerene tetrad (SubPc-TPA-(C60)2) were studied. The geometric and electronic structures of the triad were probed by ab initio B3LYP/3-21G method, which predicts SubPc-TPA.+-C60.- as a stable charge-separated state. The photoinduced events via the excited singlet state of SubPc were monitored by time-resolved emission measurements as well as transient absorption techniques. Efficient charge-separations via the excited states of SubPc were observed with the rates of a??1010 s _1. Compared with the SubPc - TPA dyad, a long-lived charge-separated state was observed for the SubPc - TPA - C60 triad with the lifetime of the radical ion pairs (??RIP) of 670 ns in benzonitrile. Interestingly, further charge stabilization was achieved in the charge-separated state of SubPc - TPA - (C60)2, in which the ??RIP was found to be 1050 ns in benzonitrile. ? 2008 American Chemical Society.